While the particle dark matter hypothesis (primarily WIMPs or axions) is the dominant paradigm, a minority of scientists explore alternative explanations, most notably Modified Newtonian Dynamics (MOND). MOND proposes that Newton's laws of gravity are inaccurate at very low accelerations, such as those found at the outer edges of galaxies. By modifying gravity, MOND can explain galaxy rotation curves without invoking unseen matter. However, MOND struggles to explain other key observations, such as the Bullet Cluster, gravitational lensing in general, and the Cosmic Microwave Background anisotropies, without introducing additional, less elegant assumptions. Other alternatives include theories that modify General Relativity itself, or propose more complex interactions for known particles. While these theories face significant challenges in matching the full suite of cosmological observations that the ΛCDM model successfully explains, they serve an important role by pushing the boundaries of theoretical physics and ensuring that the dark matter paradigm is rigorously tested and not simply accepted without critical scrutiny. The scientific process thrives on such healthy skepticism and alternative hypotheses.